We got close to nuclear war several times (thank you Stanislav Petrov!). This AI concern seems small potatoes to anyone who had nightmares from Threads, The Day After, or (a generation earlier) On the Beach.
Plus, any effort to really address climate warning will necessarily prohibit large fossil fuel consumption, so lets just fix global warming, through the same international collaboration we did to prevent global warming and to repair at least some of the ozone hole damage caused by CFCs.